Antenna structure

Abstract

An antenna structure includes a radiation element, a grounding element, a feeding point, and a connection element. The radiation element includes a first radiator and a second radiator. The second radiator includes a first end close to a first end of the first radiator. The grounding element is coupled to the first end of the second radiator. The feeding point is coupled to the first end of the first radiator and is close to the first end of the second radiator. The connection element is coupled between the feeding point and the grounding element. The radiation element, the grounding element, the feeding point, and the connection element are constructed by metal wire.

1. An antenna structure, comprising:
 a radiation element, comprising:
 a first radiator, having a first end; and 
 a second radiator, having a first end close to the first end of the first radiator; 
 
 a grounding element, coupled to the first end of the second radiator; 
 a feeding point, coupled to the first end of the first radiator and close to the first end of the second radiator; 
 a fixing element, coupled to the grounding element, the fixing element having a hole for fixing the antenna structure on a substrate; and 
 a connection element, coupled between the feeding point and the grounding element, wherein the radiation element, the grounding element, the fixing element, the feeding point, and the connection element are constructed by metal wire. 
 
   
   
     2. The antenna structure of  claim 1 , wherein the first radiator and the second radiator extend in different directions. 
   
   
     3. The antenna structure of  claim 2 , wherein a length of the first radiator is approximately one-fourth of a wavelength of a first resonance mode generated by the antenna structure; and a length of the second radiator is approximately one-fourth of a wavelength of a second resonance mode generated by the antenna structure. 
   
   
     4. The antenna structure of  claim 1 , wherein the first radiator and the second radiator extend in an identical direction. 
   
   
     5. The antenna structure of  claim 4 , wherein a length of the first radiator is approximately one-fourth of a wavelength of a first resonance mode generated by the antenna structure; and an overlapping portion of the first radiator and the second radiator is used for resonating a second resonance mode of the antenna structure. 
   
   
     6. The antenna structure of  claim 1 , further comprising:
 a coaxial cable, having a first conductor layer, a first isolation layer, a second conductor layer, and a second isolation layer, wherein the first isolation layer covers the first conductor layer and lies between the first conductor layer and the second conductor layer, the second isolation layer covers the second conductor layer, the first conductor layer is coupled to the feeding point of the antenna structure, and the second conductor layer is coupled to the grounding element of the antenna structure. 
 
   
   
     7. The antenna structure of  claim 1 , further comprising:
 a first electric wire, coupled to the feeding point of the antenna structure; and 
 a second electric wire, coupled to the grounding element of the antenna structure. 
 
   
   
     8. An antenna structure formed by bending an identical metal wire, comprising:
 a radiation element, comprising:
 a first radiator, located at one end of the metal wire; and 
 a second radiator, located at another end of the metal wire; 
 
 a connection element, coupled to the first radiator; 
 a grounding element, coupled to the second radiator; and 
 a feeding point, coupled between the first radiator and the connection element, wherein the radiation element, the connection element, the grounding element, and the feeding point are on the same plane. 
 
   
   
     9. The antenna structure of  claim 8 , wherein the first radiator and the second radiator extend in different directions. 
   
   
     10. The antenna structure of  claim 9 , wherein a length of the first radiator is approximately one-fourth of a wavelength of a first resonance mode generated by the antenna structure; and a length of the second radiator is approximately one-fourth of a wavelength of a second resonance mode generated by the antenna structure. 
   
   
     11. The antenna structure of  claim 8 , wherein the first radiator and the second radiator extend in an identical direction. 
   
   
     12. The antenna structure of  claim 11 , wherein a length of the first radiator is approximately one-fourth of a wavelength of a first resonance mode generated by the antenna structure; and an overlapping portion of the first radiator and the second radiator is used for resonating a second resonance mode of the antenna structure. 
   
   
     13. The antenna structure of  claim 8 , further comprising:
 a coaxial cable, having a first conductor layer, a first isolation layer, a second conductor layer, and a second isolation layer, wherein the first isolation layer covers the first conductor layer and lies in between the first conductor layer and the second conductor layer, the second isolation layer covers the second conductor layer, the first conductor layer is coupled to the feeding point of the antenna structure, and the second conductor layer is coupled to the grounding element of the antenna structure. 
 
   
   
     14. The antenna structure of  claim 8 , further comprising:
 a first electric wire, coupled to the feeding point of the antenna structure; and 
 a second electric wire, coupled to the grounding element of the antenna structure. 
 
   
   
     15. An antenna structure, comprising:
 a radiation element, comprising a first radiator and a second radiator; 
 a connection element, coupled to the first radiator; 
 a grounding element, coupled to the second radiator; 
 a feeding point, coupled between the first radiator and the connection element, wherein the radiation element, the connection element, the grounding element, and the feeding point are constructed by metal wire; 
 a fixing element, coupled to the grounding element, the fixing element having a hole for fixing the antenna structure on a substrate; and 
 a coaxial cable, having a first conductor layer and a second conductor layer, wherein the first conductor layer is coupled to the feeding point and the second conductor layer is coupled to the grounding element. 
 
   
   
     16. The antenna structure of  claim 15 , wherein the first radiator and the second radiator extend in different directions. 
   
   
     17. The antenna structure of  claim 16 , wherein a length of the first radiator is approximately one-fourth of a wavelength of a first resonance mode generated by the antenna structure; and a length of the second radiator is approximately one-fourth of a wavelength of a second resonance mode generated by the antenna structure. 
   
   
     18. The antenna structure of  claim 15 , wherein the first radiator and the second radiator extend in an identical direction. 
   
   
     19. The antenna structure of  claim 18 , wherein a length of the first radiator is approximately one-fourth of a wavelength of a first resonance mode generated by the antenna structure; and an overlapping portion of the first radiator and the second radiator is used for resonating a second resonance mode of the antenna structure. 
   
   
     20. An antenna structure, comprising:
 a radiation element, comprising:
 a first radiator, having a first end; and 
 a second radiator, having a first end close to the first end of the first radiator, wherein the first end of the second radiator is not directly coupled to the first end of the first radiator, such that there is a gap formed between the first end of the second radiator and the first end of the first radiator; 
 
 a grounding element, coupled to the first end of the second radiator; 
 a feeding point, coupled to the first end of the first radiator and close to the first end of the second radiator; and 
 a connection element, coupled between the feeding point and the grounding element, wherein the radiation element, the grounding element, the feeding point, and the connection element are constructed by metal wire.